*{
    margin: 0;
    padding: 0;
}
body,html{
    height: 100%;
    width: 100%;
}
.box{
    width: 100%;
    text-align: center;
 
}
.header{
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: #333;
}
.nav{
    overflow: hidden;
    width: 80%;
    text-align: center;
}
.nav a{ 
    display:inline-block;
    color: white;
    padding: 20px 30px;
    text-decoration: none;
}
.nav a:hover{
    background-color: cadetblue;
}
.left_nav{
    float: left;
}
.right_nav{
    float: right;
}
.right_four{
    background-color: cadetblue;
}
/* ----------------------------------------------------------- */
.img_box{

    overflow: hidden;
    width: 100%;
    height: 100vh;
    margin-bottom: 100px;
    background: url(../image/sy1.jpg) no-repeat scroll transparent;
    background-size: 100% 100%;
}
.img_box p{
    position: relative;
    top: 40%;
    color: white;
    line-height: 2;
}
.img_box p:first-child{
    font-family: MD;
    font-size: 4vw;
}

/* ------------------------------------------------------------- */
.content_box{
    width:80%;
    height: 100%;
    margin: 0 auto;
}
.content{
    padding: 20px;
    /* height: 100%; */
    display: flex;
    /* box-shadow: 0px 0px 15px 0px rgba(0, 0, 0, 0.1); */
    justify-content: space-between;
    position: relative;
}
.one_box{
    width: 50%;
    margin: 10px 20px;
    box-shadow: 0px 0px 15px 0px rgba(0, 0, 0, 0.1);
    background-color: white;
    overflow: auto;
}
.one_box:hover{
    transform: scale(1.05);
    transition: all 0.8s;
    cursor: pointer;
    box-shadow: 0px 0px 15px 0px rgba(0, 0, 0, 0.5);
}
.content img{
    width: 100%;
    height: 30%;
}
.one_item{
    padding: 16px;
}
.one_item p{
    text-align: center;
    font-size: 24px;
    color:skyblue;
    margin-bottom: 5px; 
}
.one_item span{
    line-height: 1.5;
}
h2{
    font-size: 36px;
    color: aqua;
    position: absolute;
    top: -50px;
    left: 40px;
}
/* -------------------------------------- */
.two_box,.tree_box{
    width: 100%;
    /* height: 300px; */
    margin: 0 20px;
    transition: 0.4s;
}
.two_box img{
    width: 100%;
    height: 300px;
}

.tree_box img{
    width: 100%;
    height: 300px;
}

.two_box:hover{
    cursor: pointer;
    transform: translateY(-20px);
}
.two_item{
    display: flex;
    justify-content: space-between;
}

.two_item p,.two_item span{
    display: inline;
    padding: 15px;
    font-size: 24px;
    color: black;
}
/* ----------------------------------------------- */
.tree_item{
    position: relative;
    bottom: 300px;
    font-size: 30px;
    padding: 10px;
    float: right;
    color: white;
    font-family: MD;
}
@font-face{
    font-family: MD;
    src: url(../font/MD.ttf);
}
.tree_box:hover{
    transform: scale(0.95);
    cursor: pointer;
}
/* ------------------------------------------------- */
footer{
    width: 100%;
    background-color: #363636;
}
.footer_box{
    width: 80%;
    margin: auto;
    text-align: center;
    display: flex;
    justify-content: space-between;
    color: white;
}
.left_box{
    width: 40%;
    text-align: center;
}
.right_box{
    width: 60%;
    padding: 20px;
    margin: 60px 0 60px 0;
} 
.one{
    font-size: 2vw;
    font-weight: 700;
    margin-top: 50px;
}
.two{
    margin-top: 30px;
}
.three{
    color:aquamarine;
    font-size: 2.2vw;
}
.item_box{
    width: 50%;
    height: 50%;
    float: left;
}
.item_box p,span{
    float: left;
    padding: 20px;
}

.item_box span{
    position: relative;
    left: -10%;
}
